In the run up to the summer, we're all hard at work trying to shake off those extra kilos so we can do justice to our new bikinis.

But once the holidays actually start, it's all too easy to let the discipline slip, and we find we've put the weight back on before we get back to the office: all that pre-summer effort simply goes down the drain.

Dr. Pierre Dukan, author of the hugely popular Dukan diet, offers five keys to keep your weight down over the summer, with a special emphasis on "how to eat."??